Change of Crystal Orientation of a Single Crystal Copper Specimen by Nano Plastic Forming

Abstract

This paper reports a study on crystal rotation in a single crystal copper specimen by a knife edge tool indentation. A rectangle specimen was made from a single crystal copper ingot so that its edges correspond with <100> crystal direction. Indentation tests were conducted on its {001} plane by using a knife edge tool, where the direction of tool edge were set in various direction on the {001} plane. Cross sections of the indent grooves were analyzed by FIB. Results show that indent depth depends on tool direction. Then, distribution of crystal orientation around an indent groove was analyzed by EBSD. Spin vectors of the crystal structure were calculated from EBSD data. Distribution of spin vector revealed that crystal rotation around an indent groove is separated into two zones ; the upper zone rotates to inside direction but the lower zone rotates to outside direction. Also, most of the spin vectors indicates [100] crystal orientation regardless of tool direction.